And goldsbury harden



(N0 Model.)

G. s. WOLF & GfH. POND. GOMPOUND STEAM ENGINE.

No. 565,063. Patented Aug, 4, 1896;

%QW 43y UNITED STATES PATENT OFFICE.

GEORGE SAAIi IVOLF, OF DETROIT, MICHIGAN, AND GOLDSBURY HARDEN POND, OFASHBURNIIAM, MASSACHUSETTS.

COMPOUND STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 565,063, dated August4, 1896. Application filed August 31, 1894. Serial No. 522,309. (Nomodel.)

To all whom it may concern.-

Be it'known that we, GEORGE SAAL IVOLF, residing at Detroit, county oflVayne, and State of Michigan, and GoLnsBURY HARDEN POND, residing atAshburnham, county of Worcester, and State of Massachusetts, citi- Zensof the United States, have invented certain new and useful Improvementsin Steam- Engines, of which the following is a specification.

This invention relates to improvements in compound steam-engines; and itconsists in the combinatiomwith two cylinders, of a valve mechanisminterposed directly between the two cylinders in such a manner that thesteam-passages lead in short direct lines from one cylinder into theother and one pair of valves serves for both cylinders, the objectsbeing to obtain very short steam-passages for avoiding the cooling ofthe steam and the turning of sharp corners in the steam-passages,resulting in great simplicity of construction and in economy ofoperation, substantially as hereinafter described, and pointed out inthe claim.

In the accompanying drawings, Figure 1 is a vertical section through thecylinders and the valve mechanism, showing the location and arrangementof stea1n passages between the cylinders, the relative position of theinlet and exhaust ports, and the valves controlling said ports andpassages. Fig. 2 is an exterior view of valves and cylinders. Fig. 3 isan end view of the same. Fig. 4 is a detached view of one of the valves.

Arepresents a high-pressure cylinder, and B a low-pressure cylinder.Between these cylinders is located a compact valve mechanism, consistingof a steam-chest 0, cast solid with the two cylinders, the inlet-portsbeing at each end of said chest. The heads of the cylinders are attachedin the usual manner. In said heads are made broad grooves a a0. a, whichconnect with the straight passages c 0 through the chest leading fromone cylinder to the other. Inlet-ports b b are provided in each end ofthe chest, and a common exhaust-port e at the middle of the chestconnected by passages 11 d with the valves. The valve-seats consist ofstraight bores through the chest transversely with the cylinders and thesaid straight steam-passages c c. The valves consist of two disks F F,-joined by two webs f j, which provide a passage between and at each sideof said webs, as seen in Figs.

1 and 4. These valves are fitted in the bores or seats, as seen in Fig.1, with one valve having its middle passage in open communication withthe lower steam-passage 0, thus making a perfectly straight shortcommunication for the exhaust from cylinder A into cylinder B. At thesametime the other valve has its middle passage in a diagonal line,which brings its side passages one in open communication with theinlet-port at the upper end of the chest and its opposite side passagein open communication with the exhaust-port in cylinder B and theexhaustoutlet at the middle of the chest. It will be seen that byreversing the position of the valves relatively that the steam will beadmitted to the opposite end of cylinder A and the exhaust from saidcylinder A will be into the upper end of cylinder 13.

The ends of the valve-chambers are closed by caps and the valve-stemsproject at one end and are provided with cranks connected to areciprocating rod for operating the valves by eccentric or link motionin the usual manner. (Not shown.)

Sleeve-linings J are provided in the valveseats, composed of hard whitemetal, to pro duce a frictionless and steam-tight bearing, and strips ofsame metal are placed in grooves L L in the edges of the webs of thevalve for the same purpose.

By this construction the advantages of very short and directsteam-passages are derived, and the valves are practically balanced byan equal pressure of steam on all sides, so there will be very littlewear.

Having described our invention, we claim- The combination in a compoundengine, of cylinders A and B, the steam-chest O interposed between saidcylinders, the direct passages c 0 through said chest leading from onecylinder into the other, inlet-ports b b at each end of said chest, andthe exhaust-port at its middle, the transverse valves F F crossing thepassages c c, constructed and adapted to operate substantially asdescribed.

GEORGE SAAL WVOLF. GOLDSBURY HARDEN POND. Witnesses:

H. M. Pom), BRET I-I. BRooKs.

